Only reference distributed fonts
Only reference distributed fonts

Summary: Fixes #207.

Test Plan: Crossed fingers.

Reviewers: emily

Reviewed By: emily

Differential Revision: https://phabricator.khanacademy.org/D16871

JetStarBlues/KaTeX,azotova/KaTeX,zhanghuiguoanlige/KaTeX,kevinbarabash/KaTeX,spicyj/KaTeX,saschatimme/KaTeX,kwangkim/katex-npm-0.7.0-pre,kevinbarabash/KaTeX,crepererum/KaTeX,franciscop/KaTeX,kwangkim/KaTeX,gagern/KaTeX,franciscop/KaTeX,zhanghuiguoanlige/KaTeX,zhanghuiguoanlige/KaTeX,gagern/KaTeX,azotova/KaTeX,frankandrobot/KaTeX,azotova/KaTeX,spicyj/KaTeX,franciscop/KaTeX,frankandrobot/KaTeX,xymostech/KaTeX,kwangkim/katex-npm-0.7.0-pre,kwangkim/KaTeX,kwangkim/katex-npm-0.7.0-pre,saschatimme/KaTeX,Khan/KaTeX,xymostech/KaTeX,mcanthony/KaTeX,frankandrobot/KaTeX,twitwi/KaTeX,frankandrobot/KaTeX,spicyj/KaTeX,Khan/KaTeX,franciscop/KaTeX,franciscop/KaTeX,kwangkim/KaTeX,saschatimme/KaTeX,twitwi/KaTeX,kwangkim/katex-npm-0.7.0-pre,JetStarBlues/KaTeX,zhanghuiguoanlige/KaTeX,zhanghuiguoanlige/KaTeX,xymostech/KaTeX,JetStarBlues/KaTeX,azotova/KaTeX,crepererum/KaTeX,kevinbarabash/KaTeX,kwangkim/katex-npm-0.7.0-pre,twitwi/KaTeX,frankandrobot/KaTeX,xymostech/KaTeX,kwangkim/KaTeX,gagern/KaTeX,kwangkim/KaTeX,crepererum/KaTeX,saschatimme/KaTeX,kevinbarabash/KaTeX,kevinbarabash/KaTeX,spicyj/KaTeX,gagern/KaTeX,mcanthony/KaTeX,JetStarBlues/KaTeX,mcanthony/KaTeX,crepererum/KaTeX,mcanthony/KaTeX,saschatimme/KaTeX,mcanthony/KaTeX,JetStarBlues/KaTeX,azotova/KaTeX,twitwi/KaTeX,twitwi/KaTeX,Khan/KaTeX,gagern/KaTeX,crepererum/KaTeX,spicyj/KaTeX,xymostech/KaTeX